Ventilating fan



March 16 1926., I 1,577,280

S. A. XIPPAS VENTILATING FAN Filed Nov. 9, 1925 2 Sheets-Sheet 1 March 16 ,-1926.' 1,577,280

' s. A. XIPPAS VENTILATING FAN File d Nov 9, 1925 ZSheets-Sheei 2 glwuentoz jam/e5 @WJW ENTEFJN ZONE f 0 o 0 0 n 0 u n o o g m w m 6 m 6 m m Patented Mar. 16, 1926.

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Application fled- November a, 1925. Serial-1T0. 67,797.

To all ivkom it may concern:

Be it known that I, SOOBATES A. Xrrms, a citizen of the United States, and resi-- dent of Pittsburgh, 'in the county of Allegheny and State of Pennsylvania, have invented certain new and useful Improvements 'in Ventilating Fans, of which the following v is a specification;

Thls invention relates to electric fans and one object of m invention is to provide a vertical electric fan, which is neat in appearance and durable in construction and one which will efiectively distribute and keep in circulation the air of a room.

Another object of my invention is to provide an electric fan which will properly distribute the air in a room, thus maintaining an even temperature in a room at all times and at the same time preventing a strong blast of air being delivered in any direction.

Another object of my invention is to pro-- vide such an electric fan in which the air from the upper and lower parts of the room, where the extreme temperatures prevail, are drawn into the fan and discharged through the center of the fan, thus maintaining the entire air contents of the room at an even temperature.

Another object of my invention is to pro vide such an electric fan as will maintain correct ventilation in the breathing space of a room, that is, that space which is between a persons head while standing and a persons head while sitting.

Another object of my invention is to provide such an electric fan with an air cooled motor, the air while being drawn into the fan casing providing the means for cooling the moto Still another object of my invention is to provide such a fan that is noiseless in operation and in which there is no rushing or blowing of air.

I accomplished the above and other .objects of the invention which will be apparent as the description proceeds by means of the device shown in the accompanying drawings, in which:

Fig. l is a perspective of the device;

Fig. 2'is a vertical central section of the device;

Fig. 3 is a top plan view of the rotary blast device;

tance than the openings 5, 5, the

PATENT OFFICE.

In the'drawings, in which like reference characters indicate like parts on all the figures thereof, 1 indicates the fan casing and 2 the motor casing which also serves as the. supporting stand for the fan casing and enclosed elements. The fan casing is formed of two hemispherical parts 3, 3, eachof which is provided with two series of openings. Qne series of openin 4, 4 are arranged in the medial zone of t e casing and the other series of openings 5, 5 are arranged in the polar zones of the easing. The openin s 4, 4 are of elongated form and extend or a greater vertical disurpose of which will be apparent as the escription proceeds.

Within the casing 1 is the rotary blast device or fan proper, which comprises the blades 6, each of'which is substantially the shape of the quadrant of a circle. A late '2 is provided with four arms 8 substantlally at right angles to each other, each arm having a flange 9 at one edge thereof to which is attached a fan blade, two of the blades being disposed above the plate 7 and two below.

The opposed edges of the two upper blades are connected at their peripheral portions by means of an adjustable band comprisin two strap elements 10, 10 having slotte ends through which is passed a set screw 11. The opposed edges of the two lower blades are similarly connected. This adjustable strap connection permits of they depending upon the velocity with which is e fan is to be operated; As examples of the relative pitch of the blades and the relative SSUED velocity of operation required to admit and discharge the same amount of air within a given period of time, the following table is iven which sets forth the actual results durmg tests 1. Discharge from fan per minute in cubic feet, at 1300 R. P. M. 1120, pitch of blades at 85%.

2. Pltqh ot blades. Velocity.

55 383 65 584 735 7&2 74:8 707 An efliciency curve A is shown in Figure 7 which charts the above results, the abscissas representing the pitch of the blades and the ordinates the velocity of operation.

The area of the openings in the medial zone is such that the amount of air drawn into the casing during'the operation of the fan will be discharged over a large surface and in such a way that no violent blast will be produced but merely a gentle breeze with a continual circulation of the surounding air.

As will be apparent by following the paths of the arrows on Fig. 2 of the drawings, air entering the entrance ports 12 in the motor casing is drawn upwardly around the motor, thus cooling the motor.

Air is also drawn into the fan casing directly from the room through openings surrounding the connections between the fan and motor casings. These two currents or air are drawn along and follow the surface of the lower fan blades.

The air surrounding the upper part of the fan casing is drawn into the casing between the upper blades until it meets and becomes commingled with the two currents entering the lower portion of the casing. Since the air entering the upper portion of the casing is of a different temperature from that entering the lower portion of the casing, this commingling action of the fan is of considerable importance since it serves to equalize the temperature of the air in the room. It is also to be noted that the air entering the lower portion of the fan casing directly from the room will be of a different temperature from that entering it from the motor casing. There are, therefore, three different stratas of air at different temperatures which meet and are commingled in the fan casing.

The continuous movement of the fan blades then forces the thoroughly commingled air of medium temperature outwardly along the fan blades and discharges it from the peripheries thereof in a tangential direction, through the openings in the medial zone of the casing.

It will be noted that the air will be drawn into the casing in the angular space between the blades and be expelled from the periphcry of the blades so that there is no tendency for the outgoing air to force the incoming air from its path as it enters the casing.

Between the medial zone and the two polar zones there are neutral zones, that is, when the air which has been drawn into the casing reaches these zones, there is no tendency for it to continue on its upward or downward path and it is therefore retarded in its movement. This retarding action takes place just before the continued movement of the fan blades forces it out against the inner surface of the casing.

The motor 13 is supported in the motor casing 2 by means of screws 14, which are screwed into lugs projecting from the band 15 surround the upper portion of the motor step bearing 16 at the lower portion thereof. The step bearing 16 comprises a nut 17 having screw threaded connection with the yoke 18, the nut being provided with a recess in which is located a steel ball 19, the position of the ball with respect to the recess being determined by the adjustment of the nut 20.

The driving connection between the motor and the fan blade supporting plate 7 comprises a post 21 which passes through a central opening in the blade and is main tained in place by the lock nut 22.

Having thus-fully described my invention, what I claim as new and desire to secure by Letters Patent of the United States is:

1. In a device of the class described, a rotary blast device, an enclosing casing therefor, said casing having a medial zone and two polar zones of openings therein, and means on said blast device whereby the air is drawn into said casing through the openings in the polar zones said means serving to discharge the air through the openings in the medial zone.

2. In a device of the class described, a rotary blast device, a spherical enclosing casing therefor, said casing having a medial zone of longitudinally extending openings therein for the discharge of air, and two polar zones of longitudinal openings for the admission of air, the area of the openings in the medial zone being relatively greater than the area of the openings in the polar zone whereby the air will be discharged over a large area with reduced force. I

3. In a device of the class described, a spherical casing, said casing having two polar zones provided with openings for the admission of air, said casing being also provided with a medial zone of openings for the discharge of air, and a rotary blast device located within said casing, said blast device comprising a plurality of blades consisting of sets of upper and lower blades, said blades being disposed at substantially right angles to each other and in planes r at an angle to the-central vertical plane passing throughthe casing.

4. In a rotary blast device, a rotatably mounted support, -aseries 'of horizontal arms onsaid support substantially at right angles to each other, a plane vertical blade attached to each arm, the pitch of the blades beinglbetween, 55 and 90.

5. n a rotary blast device, a. rotatably mounted support, a series of horizontal arms on said support at right angles to each other, a vertical blade attached to therefor, said casing having a medial zone therefor, said casing having two polar zones and two polar zones of openings therein, said blast device comprising a rotatably mounted support, separate upper and lower vertical blades on said support, all of said blades being inclined to the vertical.

8. In a device of the class described, a rotary blast device, am enclosing casing of openings therein for the admission of air, and a medial zone of openings for the discharge of air, said blastdevice comprising a rotatably mounted support, horizontal arms on said support, upper blades attached to certain of said arms and lower blades attached to other of said arms, said blades being at right angles to each other and all .of said blades being inclined to the vertical.

9 In a device of the class described, a rotary blasti device, an enclosing casing therefor provided with air admission and exhaust ports, a motor for operating said 'blast device, a casing for said motor, said first named casing being supported upon said second named casing, said second pitch of the blades being subcharged through the medial portion of named casing having an air entrance port in the lower portion thereof and being in communication with the first named casing at the top thereof. I

10. In a device of the class described, a rotary blast device, a casing therefor, said casing having air inlet ports in the upper and lower portions thereof, and air exit ports in the medial portions thereof,'and means whereby the air admitted through the upper and lower mingled and discharged through the exit ports.

11. In a device of the class described, a rotary blast device, a casing therefor, a hollow support for said casing, means for admitting air into the support, means for admitting air into the upper and lower portions of the casing, and means for admitting air into the casing from the sup port, and means whereby the air admitted ports will be com- 7 I into'the casing will be commingled and disthe casings i e "12. In a device of" the class described, a rotary blast device, a casing therefor, means for admitting air into said casing, means for discharging air from said casing, said rotary blast device comprising a plurality of blades, and means whereby air admitted into said casingwill be drawn along said blades and discharged therefrom in a tangential direction.

13. In a device of the class described, a

rotary blast' device, an openwork casing therefor, said blast device comprising a plurality of*upper blades at an angle to each other, a plurality'of lower blades at an angle to each other, and means whereby .the air will be drawn into the casing at points in the angles between the blades and discharged from the casing along the periphery of the blades In testimony whereof I hereunto aifix my signature,

SOCRATES A; XIPPAS. 

